Norwegian government IT systems hacked using zero-day flaw

That's a point of honor. Public institutions in most countries are hacked because they still run servers with windows xp last updated in 1998

It seems like you accidentally responded to the post instead of the comment.

What surprises me is that if there is a zero-day flaw in a system used by the Norwegian government, why haven't other entities been hacked? Is the system in question some system only used by the Norwegian government?